I'd replace the mufflers. Ansa and Eberspaeker are good, Borsal a bit less so. Best is Timevalve stainless, but that will be pricy (although sometimes less than the OEM ones, belive it or not!).

The reason you don't notice much difference in sound is that the resonator is rusted away internally too, so you really don't have any muffler at all. It will be quieter with new ones.

My brother needs to investigate a new exhaust on the 75 -- I can hear it badly in the house when he stops over.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!